Let us reject some answers. AM and FM radio waves do not interfere. Am are an orders of magnitude larger than FM waves. FM waves belong to microwaves, a subcategory of radiowaves while AM does not. Similarly, AM and TV have not the same, because TV uses a subset of the frequencies used in FM. The correct answe is that CB radios and submarine communication happen at the same wavelengths/frequencies, namely low frequency radiowaves.
The angular acceleration of a rotating object is given by where is the final angular speed of the object is its initial angular speed is the time taken to accelerate
For the wheel in our problem, , and , so its angular acceleration is
The needle on a compass always points in the direction of magnetic north because of the magnetic poles of earth. the compass is essentially a magnet itself, so the southern pole of the compass is attracted to the northern pole of earth.
is the final angular speed of the object
is its initial angular speed
is the time taken to accelerate
, 
and 
, so its angular acceleration is